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|
/*
* This file is part of the Nice GLib ICE library.
*
* (C) 2006-2009 Collabora Ltd.
* Contact: Youness Alaoui
* (C) 2006-2009 Nokia Corporation. All rights reserved.
* Contact: Kai Vehmanen
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Nice GLib ICE library.
*
* The Initial Developers of the Original Code are Collabora Ltd and Nokia
* Corporation. All Rights Reserved.
*
* Contributors:
* Dafydd Harries, Collabora Ltd.
* Youness Alaoui, Collabora Ltd.
* Kai Vehmanen, Nokia
*
* Alternatively, the contents of this file may be used under the terms of the
* the GNU Lesser General Public License Version 2.1 (the "LGPL"), in which
* case the provisions of LGPL are applicable instead of those above. If you
* wish to allow use of your version of this file only under the terms of the
* LGPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replace
* them with the notice and other provisions required by the LGPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the LGPL.
*/
/*
* @file component.c
* @brief ICE component functions
*/
/* Simple tracking for the number of alive components. These must be accessed
* atomically. */
static volatile unsigned int n_components_created = 0;
static volatile unsigned int n_components_destroyed = 0;
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include "debug.h"
#include "component.h"
#include "discovery.h"
#include "agent-priv.h"
G_DEFINE_TYPE (NiceComponent, nice_component, G_TYPE_OBJECT);
typedef enum {
PROP_ID = 1,
PROP_AGENT,
PROP_STREAM,
} NiceComponentProperty;
static void
nice_component_constructed (GObject *obj);
static void
nice_component_get_property (GObject *obj,
guint property_id, GValue *value, GParamSpec *pspec);
static void
nice_component_set_property (GObject *obj,
guint property_id, const GValue *value, GParamSpec *pspec);
static void
nice_component_finalize (GObject *obj);
static void
nice_component_schedule_io_callback (NiceComponent *component);
static void
nice_component_deschedule_io_callback (NiceComponent *component);
static void
nice_component_detach_socket (NiceComponent *component, NiceSocket *nicesock);
static void
nice_component_clear_selected_pair (NiceComponent *component);
void
incoming_check_free (IncomingCheck *icheck)
{
g_free (icheck->username);
g_slice_free (IncomingCheck, icheck);
}
/* Must *not* take the agent lock, since it’s called from within
* nice_component_set_io_context(), which holds the Component’s I/O lock. */
static void
socket_source_attach (SocketSource *socket_source, GMainContext *context)
{
GSource *source;
if (socket_source->socket->fileno == NULL)
return;
/* Do not create a GSource for UDP turn socket, because it
* would duplicate the packets already received on the base
* UDP socket.
*/
if (socket_source->socket->type == NICE_SOCKET_TYPE_UDP_TURN)
return;
/* Create a source. */
source = g_socket_create_source (socket_source->socket->fileno,
G_IO_IN, NULL);
g_source_set_callback (source, (GSourceFunc) G_CALLBACK (component_io_cb),
socket_source, NULL);
/* Add the source. */
nice_debug ("Attaching source %p (socket %p, FD %d) to context %p", source,
socket_source->socket, g_socket_get_fd (socket_source->socket->fileno),
context);
g_assert (socket_source->source == NULL);
socket_source->source = source;
g_source_attach (source, context);
}
static void
socket_source_detach (SocketSource *source)
{
nice_debug ("Detaching source %p (socket %p, FD %d) from context %p",
source->source, source->socket,
(source->socket->fileno != NULL) ?
g_socket_get_fd (source->socket->fileno) : 0,
(source->source != NULL) ? g_source_get_context (source->source) : 0);
if (source->source != NULL) {
g_source_destroy (source->source);
g_source_unref (source->source);
}
source->source = NULL;
}
static void
socket_source_free (SocketSource *source)
{
socket_source_detach (source);
nice_socket_free (source->socket);
g_slice_free (SocketSource, source);
}
NiceComponent *
nice_component_new (guint id, NiceAgent *agent, NiceStream *stream)
{
return g_object_new (NICE_TYPE_COMPONENT,
"id", id,
"agent", agent,
"stream", stream,
NULL);
}
void
nice_component_remove_socket (NiceAgent *agent, NiceComponent *cmp,
NiceSocket *nsocket)
{
GSList *i;
NiceStream *stream;
stream = agent_find_stream (agent, cmp->stream_id);
discovery_prune_socket (agent, nsocket);
refresh_prune_socket (agent, nsocket);
if (stream)
conn_check_prune_socket (agent, stream, cmp, nsocket);
for (i = cmp->local_candidates; i;) {
NiceCandidateImpl *candidate = (NiceCandidateImpl *) i->data;
GSList *next = i->next;
if (!nice_socket_is_based_on (candidate->sockptr, nsocket)) {
i = next;
continue;
}
if (candidate == cmp->selected_pair.local)
nice_component_clear_selected_pair (cmp);
refresh_prune_candidate (agent, candidate);
if (candidate->sockptr != nsocket && stream) {
discovery_prune_socket (agent, candidate->sockptr);
conn_check_prune_socket (agent, stream, cmp, candidate->sockptr);
nice_component_detach_socket (cmp, candidate->sockptr);
}
if (stream)
agent_remove_local_candidate (agent, stream, (NiceCandidate *) candidate);
nice_candidate_free ((NiceCandidate *)candidate);
cmp->local_candidates = g_slist_delete_link (cmp->local_candidates, i);
i = next;
}
/* The nsocket to be removed may also come from a
* peer-reflexive remote candidate
*/
for (i = cmp->remote_candidates; i;) {
NiceCandidateImpl *candidate = i->data;
GSList *next = i->next;
if (candidate->sockptr != nsocket) {
i = next;
continue;
}
if (candidate == cmp->selected_pair.remote)
nice_component_clear_selected_pair (cmp);
if (stream)
conn_check_prune_socket (agent, stream, cmp, candidate->sockptr);
nice_candidate_free ((NiceCandidate *) candidate);
cmp->remote_candidates = g_slist_delete_link (cmp->remote_candidates, i);
i = next;
}
nice_component_detach_socket (cmp, nsocket);
}
static gboolean
on_candidate_refreshes_pruned (NiceAgent *agent, NiceCandidateImpl *candidate)
{
NiceComponent *component;
if (agent_find_component (agent, candidate->c.stream_id,
candidate->c.component_id, NULL, &component)) {
nice_component_detach_socket (component, candidate->sockptr);
}
nice_candidate_free ((NiceCandidate *) candidate);
return G_SOURCE_REMOVE;
}
void
nice_component_clean_turn_servers (NiceAgent *agent, NiceComponent *cmp)
{
GSList *i;
GSList *relay_candidates = NULL;
NiceStream *stream;
stream = agent_find_stream (agent, cmp->stream_id);
g_list_free_full (cmp->turn_servers, (GDestroyNotify) turn_server_unref);
cmp->turn_servers = NULL;
for (i = cmp->local_candidates; i;) {
NiceCandidateImpl *candidate = i->data;
GSList *next = i->next;
if (candidate->c.type != NICE_CANDIDATE_TYPE_RELAYED) {
i = next;
continue;
}
/* note: do not remove the remote candidate that is
* currently part of the 'selected pair', see ICE
* 9.1.1.1. "ICE Restarts" (ID-19)
*
* So what we do instead is that we put the selected candidate
* in a special location and keep it "alive" that way. This is
* especially important for TURN, because refresh requests to the
* server need to keep happening.
*/
if (candidate == cmp->selected_pair.local) {
if (cmp->turn_candidate) {
relay_candidates = g_slist_append(relay_candidates, cmp->turn_candidate);
}
/* Bring the priority down to 0, so that it will be replaced
* on the new run.
*/
cmp->selected_pair.priority = 0;
cmp->turn_candidate = candidate;
} else {
agent_remove_local_candidate (agent, stream, (NiceCandidate *) candidate);
relay_candidates = g_slist_append(relay_candidates, candidate);
}
cmp->local_candidates = g_slist_delete_link (cmp->local_candidates, i);
i = next;
}
for (i = relay_candidates; i; i = i->next) {
NiceCandidateImpl * candidate = i->data;
discovery_prune_socket (agent, candidate->sockptr);
if (stream) {
conn_check_prune_socket (agent, stream, cmp, candidate->sockptr);
}
refresh_prune_candidate_async (agent, candidate,
(NiceTimeoutLockedCallback) on_candidate_refreshes_pruned);
}
}
static void
nice_component_clear_selected_pair (NiceComponent *component)
{
if (component->selected_pair.remote_consent.tick_source != NULL) {
g_source_destroy (component->selected_pair.remote_consent.tick_source);
g_source_unref (component->selected_pair.remote_consent.tick_source);
component->selected_pair.remote_consent.tick_source = NULL;
}
memset (&component->selected_pair, 0, sizeof(CandidatePair));
}
/* Must be called with the agent lock held as it touches internal Component
* state. */
void
nice_component_close (NiceAgent *agent, NiceStream *stream, NiceComponent *cmp)
{
IOCallbackData *data;
GOutputVector *vec;
IncomingCheck *c;
/* Start closing the pseudo-TCP socket first. FIXME: There is a very big and
* reliably triggerable race here. pseudo_tcp_socket_close() does not block
* on the socket closing — it only sends the first packet of the FIN
* handshake. nice_component_close() will immediately afterwards close the
* underlying component sockets, aborting the handshake.
*
* On the principle that starting the FIN handshake is better than not
* starting it, even if it’s later truncated, call pseudo_tcp_socket_close().
* A long-term fix is needed in the form of making nice_component_close() (and
* all its callers) async, so we can properly block on closure. */
if (cmp->tcp) {
pseudo_tcp_socket_close (cmp->tcp, TRUE);
}
if (cmp->restart_candidate)
nice_candidate_free (cmp->restart_candidate),
cmp->restart_candidate = NULL;
if (cmp->turn_candidate)
nice_candidate_free ((NiceCandidate *) cmp->turn_candidate),
cmp->turn_candidate = NULL;
while (cmp->local_candidates) {
agent_remove_local_candidate (agent, stream, cmp->local_candidates->data);
nice_candidate_free (cmp->local_candidates->data);
cmp->local_candidates = g_slist_delete_link (cmp->local_candidates,
cmp->local_candidates);
}
g_slist_free_full (cmp->remote_candidates,
(GDestroyNotify) nice_candidate_free);
cmp->remote_candidates = NULL;
nice_component_free_socket_sources (cmp);
while ((c = g_queue_pop_head (&cmp->incoming_checks)))
incoming_check_free (c);
nice_component_clean_turn_servers (agent, cmp);
if (cmp->tcp_clock) {
g_source_destroy (cmp->tcp_clock);
g_source_unref (cmp->tcp_clock);
cmp->tcp_clock = NULL;
}
if (cmp->tcp_writable_cancellable) {
g_cancellable_cancel (cmp->tcp_writable_cancellable);
g_clear_object (&cmp->tcp_writable_cancellable);
}
while ((data = g_queue_pop_head (&cmp->pending_io_messages)) != NULL)
io_callback_data_free (data);
nice_component_deschedule_io_callback (cmp);
g_cancellable_cancel (cmp->stop_cancellable);
while ((vec = g_queue_pop_head (&cmp->queued_tcp_packets)) != NULL) {
g_free ((gpointer) vec->buffer);
g_slice_free (GOutputVector, vec);
}
g_free (cmp->recv_buffer);
g_free (cmp->rfc4571_buffer);
cmp->recv_buffer = NULL;
cmp->rfc4571_buffer = NULL;
}
void
nice_component_shutdown (NiceComponent *component, gboolean shutdown_read,
gboolean shutdown_write)
{
GSList *i;
g_assert (shutdown_read || shutdown_write);
if (!pseudo_tcp_socket_is_closed (component->tcp)) {
PseudoTcpShutdown how;
if (shutdown_read && shutdown_write)
how = PSEUDO_TCP_SHUTDOWN_RDWR;
else if (shutdown_read)
how = PSEUDO_TCP_SHUTDOWN_RD;
else
how = PSEUDO_TCP_SHUTDOWN_WR;
pseudo_tcp_socket_shutdown (component->tcp, how);
}
for (i = component->socket_sources; i; i = i->next) {
SocketSource *source = i->data;
NiceSocket *sock = source->socket;
if (sock->type == NICE_SOCKET_TYPE_TCP_BSD)
g_socket_shutdown (sock->fileno, shutdown_read, shutdown_write, NULL);
}
}
/*
* Finds a candidate pair that has matching foundation ids.
*
* @return TRUE if pair found, pointer to pair stored at 'pair'
*/
gboolean
nice_component_find_pair (NiceComponent *cmp, NiceAgent *agent, const gchar *lfoundation, const gchar *rfoundation, CandidatePair *pair)
{
GSList *i;
CandidatePair result = { 0, };
for (i = cmp->local_candidates; i; i = i->next) {
NiceCandidateImpl *candidate = i->data;
if (strncmp (candidate->c.foundation, lfoundation, NICE_CANDIDATE_MAX_FOUNDATION) == 0) {
result.local = candidate;
break;
}
}
for (i = cmp->remote_candidates; i; i = i->next) {
NiceCandidateImpl *candidate = i->data;
if (strncmp (candidate->c.foundation, rfoundation, NICE_CANDIDATE_MAX_FOUNDATION) == 0) {
result.remote = candidate;
break;
}
}
if (result.local && result.remote) {
result.priority = agent_candidate_pair_priority (agent,
(NiceCandidate *) result.local, (NiceCandidate *) result.remote);
if (pair)
*pair = result;
return TRUE;
}
return FALSE;
}
/*
* Resets the component state to that of a ICE restarted
* session.
*/
void
nice_component_restart (NiceComponent *cmp, NiceAgent *agent)
{
GSList *i;
IncomingCheck *c;
for (i = cmp->remote_candidates; i; i = i->next) {
NiceCandidate *candidate = i->data;
/* note: do not remove the remote candidate that is
* currently part of the 'selected pair', see ICE
* 9.1.1.1. "ICE Restarts" (ID-19) */
if (candidate == (NiceCandidate *) cmp->selected_pair.remote) {
if (cmp->restart_candidate)
nice_candidate_free (cmp->restart_candidate);
cmp->restart_candidate = candidate;
}
else
nice_candidate_free (candidate);
}
g_slist_free (cmp->remote_candidates),
cmp->remote_candidates = NULL;
while ((c = g_queue_pop_head (&cmp->incoming_checks)))
incoming_check_free (c);
/* Reset the priority to 0 to make sure we get a new pair */
cmp->selected_pair.priority = 0;
cmp->have_local_consent = TRUE;
/* The stun agent may contain references to the password previously
* stored in some remote candidates, freeed here, that were used by
* keep-alive stun requests. The stun agent must be reset to get rid
* of these references.
*/
nice_agent_init_stun_agent (agent, &cmp->stun_agent);
/* note: component state managed by agent */
}
/*
* Changes the selected pair for the component to 'pair'. Does not
* emit the "selected-pair-changed" signal.
*/
void
nice_component_update_selected_pair (NiceAgent *agent, NiceComponent *component, const CandidatePair *pair)
{
NiceStream *stream;
gchar priority[NICE_CANDIDATE_PAIR_PRIORITY_MAX_SIZE];
g_assert (component);
g_assert (pair);
stream = agent_find_stream (agent, component->stream_id);
nice_candidate_pair_priority_to_string (pair->priority, priority);
nice_debug ("setting SELECTED PAIR for component %u: %s:%s (prio:%s).",
component->id, pair->local->c.foundation,
pair->remote->c.foundation, priority);
if (component->selected_pair.local &&
component->selected_pair.local == component->turn_candidate) {
discovery_prune_socket (agent,
component->turn_candidate->sockptr);
if (stream)
conn_check_prune_socket (agent, stream, component,
component->turn_candidate->sockptr);
refresh_prune_candidate_async (agent, component->turn_candidate,
(NiceTimeoutLockedCallback) on_candidate_refreshes_pruned);
component->turn_candidate = NULL;
}
nice_component_clear_selected_pair (component);
component->selected_pair.local = pair->local;
component->selected_pair.remote = pair->remote;
component->selected_pair.priority = pair->priority;
component->selected_pair.stun_priority = pair->stun_priority;
component->selected_pair.remote_consent.have = pair->remote_consent.have;
nice_component_add_valid_candidate (agent, component,
(NiceCandidate *) pair->remote);
}
/*
* Finds a remote candidate with matching address and
* transport.
*
* @return pointer to candidate or NULL if not found
*/
NiceCandidate *
nice_component_find_remote_candidate (NiceComponent *component, const NiceAddress *addr, NiceCandidateTransport transport)
{
GSList *i;
for (i = component->remote_candidates; i; i = i->next) {
NiceCandidate *candidate = i->data;
if (nice_address_equal(&candidate->addr, addr) &&
candidate->transport == transport)
return candidate;
}
return NULL;
}
/*
* Sets the desired remote candidate as the selected pair
*
* It will start sending on the highest priority pair available with
* this candidate.
*/
NiceCandidateImpl *
nice_component_set_selected_remote_candidate (NiceComponent *component,
NiceAgent *agent, NiceCandidate *candidate)
{
NiceCandidate *local = NULL;
NiceCandidate *remote = NULL;
guint64 priority = 0;
GSList *item = NULL;
g_assert (candidate != NULL);
for (item = component->local_candidates; item; item = g_slist_next (item)) {
NiceCandidate *tmp = item->data;
guint64 tmp_prio = 0;
if (tmp->transport != conn_check_match_transport(candidate->transport) ||
tmp->addr.s.addr.sa_family != candidate->addr.s.addr.sa_family ||
tmp->type != NICE_CANDIDATE_TYPE_HOST)
continue;
tmp_prio = agent_candidate_pair_priority (agent, tmp, candidate);
if (tmp_prio > priority) {
priority = tmp_prio;
local = tmp;
}
}
if (local == NULL)
return NULL;
remote = nice_component_find_remote_candidate (component, &candidate->addr,
candidate->transport);
if (!remote) {
remote = nice_candidate_copy (candidate);
component->remote_candidates = g_slist_append (component->remote_candidates,
remote);
agent_signal_new_remote_candidate (agent, remote);
}
nice_component_clear_selected_pair (component);
component->selected_pair.local = (NiceCandidateImpl *) local;
component->selected_pair.remote = (NiceCandidateImpl *) remote;
component->selected_pair.priority = priority;
component->selected_pair.remote_consent.have = TRUE;
/* Get into fallback mode where packets from any source is accepted once
* this has been called. This is the expected behavior of pre-ICE SIP.
*/
component->fallback_mode = TRUE;
return (NiceCandidateImpl *) local;
}
static gint
_find_socket_source (gconstpointer a, gconstpointer b)
{
const SocketSource *source_a = a;
const NiceSocket *socket_b = b;
return (source_a->socket == socket_b) ? 0 : 1;
}
/* This takes ownership of the socket.
* It creates and attaches a source to the component’s context. */
void
nice_component_attach_socket (NiceComponent *component, NiceSocket *nicesock)
{
GSList *l;
SocketSource *socket_source;
g_assert (component != NULL);
g_assert (nicesock != NULL);
g_assert (component->ctx != NULL);
/* Find an existing SocketSource in the component which contains @socket, or
* create a new one.
*
* Whenever a source is added or remove to socket_sources, socket_sources_age
* must be incremented.
*/
l = g_slist_find_custom (component->socket_sources, nicesock,
_find_socket_source);
if (l != NULL) {
socket_source = l->data;
} else {
socket_source = g_slice_new0 (SocketSource);
socket_source->socket = nicesock;
socket_source->component = component;
component->socket_sources =
g_slist_prepend (component->socket_sources, socket_source);
if (nicesock->fileno != NULL)
component->socket_sources_age++;
}
/* Create and attach a source */
nice_debug ("Component %p: Attach source (stream %u).",
component, component->stream_id);
socket_source_attach (socket_source, component->ctx);
}
/* Reattaches socket handles of @component to the main context.
*
* Must *not* take the agent lock, since it’s called from within
* nice_component_set_io_context(), which holds the Component’s I/O lock. */
static void
nice_component_reattach_all_sockets (NiceComponent *component)
{
GSList *i;
for (i = component->socket_sources; i != NULL; i = i->next) {
SocketSource *socket_source = i->data;
nice_debug ("Reattach source %p.", socket_source->source);
socket_source_detach (socket_source);
socket_source_attach (socket_source, component->ctx);
}
}
/**
* nice_component_detach_socket:
* @component: a #NiceComponent
* @socket: the socket to detach the source for
*
* Detach the #GSource for the single specified @socket. It also closes it
* and frees it!
*
* If the @socket doesn’t exist in this @component, do nothing.
*/
static void
nice_component_detach_socket (NiceComponent *component, NiceSocket *nicesock)
{
GList *l;
GSList *s;
SocketSource *socket_source;
nice_debug ("Detach socket %p.", nicesock);
/* Remove the socket from various lists. */
for (l = component->incoming_checks.head; l != NULL;) {
IncomingCheck *icheck = l->data;
GList *next = l->next;
if (icheck->local_socket == nicesock) {
g_queue_delete_link (&component->incoming_checks, l);
incoming_check_free (icheck);
}
l = next;
}
/* Find the SocketSource for the socket. */
s = g_slist_find_custom (component->socket_sources, nicesock,
_find_socket_source);
if (s == NULL)
return;
/* Detach the source. */
socket_source = s->data;
component->socket_sources = g_slist_delete_link (component->socket_sources, s);
component->socket_sources_age++;
socket_source_free (socket_source);
}
/*
* Detaches socket handles of @component from the main context. Leaves the
* sockets themselves untouched.
*
* Must *not* take the agent lock, since it’s called from within
* nice_component_set_io_context(), which holds the Component’s I/O lock.
*/
void
nice_component_detach_all_sockets (NiceComponent *component)
{
GSList *i;
for (i = component->socket_sources; i != NULL; i = i->next) {
SocketSource *socket_source = i->data;
nice_debug ("Detach source %p, socket %p.", socket_source->source,
socket_source->socket);
socket_source_detach (socket_source);
}
}
void
nice_component_free_socket_sources (NiceComponent *component)
{
nice_debug ("Free socket sources for component %p.", component);
g_slist_free_full (component->socket_sources,
(GDestroyNotify) socket_source_free);
component->socket_sources = NULL;
component->socket_sources_age++;
nice_component_clear_selected_pair (component);
}
GMainContext *
nice_component_dup_io_context (NiceComponent *component)
{
return g_main_context_ref (component->own_ctx);
}
/* If @context is %NULL, it's own context is used, so component->ctx is always
* guaranteed to be non-%NULL. */
void
nice_component_set_io_context (NiceComponent *component, GMainContext *context)
{
g_mutex_lock (&component->io_mutex);
if (component->ctx != context) {
if (context == NULL)
context = g_main_context_ref (component->own_ctx);
else
g_main_context_ref (context);
nice_component_detach_all_sockets (component);
g_main_context_unref (component->ctx);
component->ctx = context;
nice_component_reattach_all_sockets (component);
}
g_mutex_unlock (&component->io_mutex);
}
/* (func, user_data) and (recv_messages, n_recv_messages) are mutually
* exclusive. At most one of the two must be specified; if both are NULL, the
* Component will not receive any data (i.e. reception is paused).
*
* Apart from during setup, this must always be called with the agent lock held,
* and the I/O lock released (because it takes the I/O lock itself). Requiring
* the agent lock to be held means it can’t be called between a packet being
* dequeued from the kernel buffers in agent.c, and an I/O callback being
* emitted for it (which could cause data loss if the I/O callback function was
* unset in that time). */
void
nice_component_set_io_callback (NiceComponent *component,
NiceAgentRecvFunc func, gpointer user_data,
NiceInputMessage *recv_messages, guint n_recv_messages,
GError **error)
{
g_assert (func == NULL || recv_messages == NULL);
g_assert (n_recv_messages == 0 || recv_messages != NULL);
g_assert (error == NULL || *error == NULL);
g_mutex_lock (&component->io_mutex);
if (func != NULL) {
component->io_callback = func;
component->io_user_data = user_data;
component->recv_messages = NULL;
component->n_recv_messages = 0;
nice_component_schedule_io_callback (component);
} else {
component->io_callback = NULL;
component->io_user_data = NULL;
component->recv_messages = recv_messages;
component->n_recv_messages = n_recv_messages;
nice_component_deschedule_io_callback (component);
}
nice_input_message_iter_reset (&component->recv_messages_iter);
component->recv_buf_error = error;
g_mutex_unlock (&component->io_mutex);
}
gboolean
nice_component_has_io_callback (NiceComponent *component)
{
gboolean has_io_callback;
g_mutex_lock (&component->io_mutex);
has_io_callback = (component->io_callback != NULL);
g_mutex_unlock (&component->io_mutex);
return has_io_callback;
}
IOCallbackData *
io_callback_data_new (const guint8 *buf, gsize buf_len)
{
IOCallbackData *data;
data = g_slice_new0 (IOCallbackData);
data->buf = g_memdup (buf, buf_len);
data->buf_len = buf_len;
data->offset = 0;
return data;
}
void
io_callback_data_free (IOCallbackData *data)
{
g_free (data->buf);
g_slice_free (IOCallbackData, data);
}
/* This is called with the global agent lock released. It does not take that
* lock, but does take the io_mutex. */
static gboolean
emit_io_callback_cb (gpointer user_data)
{
NiceComponent *component = user_data;
IOCallbackData *data;
NiceAgentRecvFunc io_callback;
gpointer io_user_data;
guint stream_id, component_id;
NiceAgent *agent;
agent = g_weak_ref_get (&component->agent_ref);
if (agent == NULL) {
nice_debug ("Agent for component %p is gone", component);
return FALSE;
}
stream_id = component->stream_id;
component_id = component->id;
g_mutex_lock (&component->io_mutex);
/* The members of Component are guaranteed not to have changed since this
* GSource was attached in nice_component_emit_io_callback(). The Component’s agent
* and stream are immutable after construction, as are the stream and
* component IDs. The callback and its user data may have changed, but are
* guaranteed to be non-%NULL at the start as the idle source is removed when
* the callback is set to %NULL. They may become %NULL during the io_callback,
* so must be re-checked every loop iteration. The data buffer is copied into
* the #IOCallbackData closure.
*
* If the component is destroyed (which happens if the agent or stream are
* destroyed) between attaching the GSource and firing it, the GSource is
* detached during dispose and this callback is never invoked. If the
* agent is destroyed during an io_callback, its weak pointer will be
* nullified. Similarly, the Component needs to be re-queried for after every
* iteration, just in case the client has removed the stream in the
* callback. */
while (TRUE) {
io_callback = component->io_callback;
io_user_data = component->io_user_data;
data = g_queue_peek_head (&component->pending_io_messages);
if (data == NULL || io_callback == NULL)
break;
g_mutex_unlock (&component->io_mutex);
io_callback (agent, stream_id, component_id,
data->buf_len - data->offset, (gchar *) data->buf + data->offset,
io_user_data);
/* Check for the user destroying things underneath our feet. */
if (!agent_find_component (agent, stream_id, component_id,
NULL, &component)) {
nice_debug ("%s: Agent or component destroyed.", G_STRFUNC);
goto done;
}
g_queue_pop_head (&component->pending_io_messages);
io_callback_data_free (data);
g_mutex_lock (&component->io_mutex);
}
component->io_callback_id = 0;
g_mutex_unlock (&component->io_mutex);
done:
g_object_unref (agent);
return G_SOURCE_REMOVE;
}
/* This must be called with the agent lock *held*. */
void
nice_component_emit_io_callback (NiceAgent *agent, NiceComponent *component,
gsize buf_len)
{
guint stream_id, component_id;
NiceAgentRecvFunc io_callback;
gpointer io_user_data;
g_assert (component != NULL);
g_assert (buf_len > 0);
stream_id = component->stream_id;
component_id = component->id;
g_mutex_lock (&component->io_mutex);
io_callback = component->io_callback;
io_user_data = component->io_user_data;
g_mutex_unlock (&component->io_mutex);
/* Allow this to be called with a NULL io_callback, since the caller can’t
* lock io_mutex to check beforehand. */
if (io_callback == NULL)
return;
g_assert (NICE_IS_AGENT (agent));
g_assert (stream_id > 0);
g_assert (component_id > 0);
g_assert (io_callback != NULL);
/* Only allocate a closure if the callback is being deferred to an idle
* handler. */
if (g_main_context_is_owner (component->ctx)) {
/* Thread owns the main context, so invoke the callback directly. */
agent_unlock_and_emit (agent);
io_callback (agent, stream_id,
component_id, buf_len, (gchar *) component->recv_buffer, io_user_data);
agent_lock (agent);
} else {
IOCallbackData *data;
g_mutex_lock (&component->io_mutex);
/* Slow path: Current thread doesn’t own the Component’s context at the
* moment, so schedule the callback in an idle handler. */
data = io_callback_data_new (component->recv_buffer, buf_len);
g_queue_push_tail (&component->pending_io_messages,
data); /* transfer ownership */
nice_debug ("%s: **WARNING: SLOW PATH**", G_STRFUNC);
nice_component_schedule_io_callback (component);
g_mutex_unlock (&component->io_mutex);
}
}
/* Note: Must be called with the io_mutex held. */
static void
nice_component_schedule_io_callback (NiceComponent *component)
{
GSource *source;
/* Already scheduled or nothing to schedule? */
if (component->io_callback_id != 0 ||
g_queue_is_empty (&component->pending_io_messages))
return;
/* Add the idle callback. If nice_agent_attach_recv() is called with a
* NULL callback before this source is dispatched, the source will be
* destroyed, but any pending data will remain in
* component->pending_io_messages, ready to be picked up when a callback
* is re-attached, or if nice_agent_recv() is called. */
source = g_idle_source_new ();
g_source_set_priority (source, G_PRIORITY_DEFAULT);
g_source_set_callback (source, emit_io_callback_cb, component, NULL);
component->io_callback_id = g_source_attach (source, component->ctx);
g_source_unref (source);
}
/* Note: Must be called with the io_mutex held. */
static void
nice_component_deschedule_io_callback (NiceComponent *component)
{
/* Already descheduled? */
if (component->io_callback_id == 0)
return;
g_source_remove (component->io_callback_id);
component->io_callback_id = 0;
}
static void
nice_component_class_init (NiceComponentClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->constructed = nice_component_constructed;
object_class->get_property = nice_component_get_property;
object_class->set_property = nice_component_set_property;
object_class->finalize = nice_component_finalize;
/**
* NiceComponent:id:
*
* The unique numeric ID of the component.
*
* Since: 0.1.14
*/
g_object_class_install_property (object_class, PROP_ID,
g_param_spec_uint (
"id",
"ID",
"The unique numeric ID of the component.",
1, G_MAXUINT, 1,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
/**
* NiceComponent:agent:
*
* The #NiceAgent this component belongs to.
*
* Since: 0.1.14
*/
g_object_class_install_property (object_class, PROP_AGENT,
g_param_spec_object (
"agent",
"Agent",
"The NiceAgent this component belongs to.",
NICE_TYPE_AGENT,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
/**
* NiceComponent:stream:
*
* The #NiceStream this component belongs to.
*
* Since: 0.1.14
*/
g_object_class_install_property (object_class, PROP_STREAM,
g_param_spec_object (
"stream",
"Stream",
"The NiceStream this component belongs to.",
NICE_TYPE_STREAM,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
}
static gboolean
dummy_callback (gpointer data)
{
return G_SOURCE_CONTINUE;
}
static void
source_set_dummy_callback (GSource *source)
{
g_source_set_callback (source, dummy_callback, NULL, NULL);
}
static void
nice_component_init (NiceComponent *component)
{
g_atomic_int_inc (&n_components_created);
nice_debug ("Created NiceComponent (%u created, %u destroyed)",
n_components_created, n_components_destroyed);
component->id = 0;
component->state = NICE_COMPONENT_STATE_DISCONNECTED;
component->restart_candidate = NULL;
component->tcp = NULL;
g_weak_ref_init (&component->agent_ref, NULL);
g_mutex_init (&component->io_mutex);
g_queue_init (&component->pending_io_messages);
component->io_callback_id = 0;
component->own_ctx = g_main_context_new ();
component->stop_cancellable = g_cancellable_new ();
component->stop_cancellable_source =
g_cancellable_source_new (component->stop_cancellable);
source_set_dummy_callback (component->stop_cancellable_source);
g_source_attach (component->stop_cancellable_source, component->own_ctx);
component->ctx = g_main_context_ref (component->own_ctx);
/* Start off with a fresh main context and all I/O paused. This
* will be updated when nice_agent_attach_recv() or nice_agent_recv_messages()
* are called. */
nice_component_set_io_context (component, NULL);
nice_component_set_io_callback (component, NULL, NULL, NULL, 0, NULL);
g_queue_init (&component->queued_tcp_packets);
g_queue_init (&component->incoming_checks);
component->have_local_consent = TRUE;
/* Maximum size of a UDP packet’s payload, as the packet’s length field is 16b
* wide. */
#define MAX_BUFFER_SIZE ((1 << 16) - 1) /* 65535 */
component->recv_buffer = g_malloc (MAX_BUFFER_SIZE);
component->recv_buffer_size = MAX_BUFFER_SIZE;
component->rfc4571_buffer_size = sizeof (guint16) + G_MAXUINT16;
component->rfc4571_buffer = g_malloc (component->rfc4571_buffer_size);
component->turn_resolving_cancellable = g_cancellable_new ();
}
static void
nice_component_constructed (GObject *obj)
{
NiceComponent *component;
NiceAgent *agent;
component = NICE_COMPONENT (obj);
agent = g_weak_ref_get (&component->agent_ref);
g_assert (agent != NULL);
nice_agent_init_stun_agent (agent, &component->stun_agent);
g_object_unref (agent);
G_OBJECT_CLASS (nice_component_parent_class)->constructed (obj);
}
static void
nice_component_get_property (GObject *obj,
guint property_id, GValue *value, GParamSpec *pspec)
{
NiceComponent *component;
component = NICE_COMPONENT (obj);
switch ((NiceComponentProperty) property_id)
{
case PROP_ID:
g_value_set_uint (value, component->id);
break;
case PROP_AGENT:
{
NiceAgent *agent;
agent = g_weak_ref_get (&component->agent_ref);
if (agent)
g_value_take_object (value, agent);
break;
}
case PROP_STREAM:
{
NiceAgent *agent;
NiceStream *stream = NULL;
agent = g_weak_ref_get (&component->agent_ref);
if (agent) {
stream = agent_find_stream (agent, component->stream_id);
g_value_set_object (value, stream);
g_object_unref (agent);
}
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, property_id, pspec);
}
}
static void
nice_component_set_property (GObject *obj,
guint property_id, const GValue *value, GParamSpec *pspec)
{
NiceComponent *component;
component = NICE_COMPONENT (obj);
switch ((NiceComponentProperty) property_id)
{
case PROP_ID:
component->id = g_value_get_uint (value);
break;
case PROP_AGENT:
g_weak_ref_set (&component->agent_ref, g_value_get_object (value));
break;
case PROP_STREAM:
{
NiceStream *stream = g_value_get_object (value);
component->stream_id = stream->id;
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, property_id, pspec);
}
}
/* Must be called with the agent lock released as it could dispose of
* NiceIOStreams. */
static void
nice_component_finalize (GObject *obj)
{
NiceComponent *cmp;
cmp = NICE_COMPONENT (obj);
/* Component should have been closed already. */
g_warn_if_fail (cmp->socket_sources == NULL);
g_warn_if_fail (cmp->local_candidates == NULL);
g_warn_if_fail (cmp->remote_candidates == NULL);
g_warn_if_fail (g_queue_get_length (&cmp->incoming_checks) == 0);
g_list_free_full (cmp->valid_candidates,
(GDestroyNotify) nice_candidate_free);
g_cancellable_cancel (cmp->turn_resolving_cancellable);
g_clear_object (&cmp->turn_resolving_cancellable);
g_clear_object (&cmp->tcp);
g_clear_object (&cmp->stop_cancellable);
g_clear_object (&cmp->iostream);
g_mutex_clear (&cmp->io_mutex);
if (cmp->stop_cancellable_source != NULL) {
g_source_destroy (cmp->stop_cancellable_source);
g_source_unref (cmp->stop_cancellable_source);
}
if (cmp->ctx != NULL) {
g_main_context_unref (cmp->ctx);
cmp->ctx = NULL;
}
g_main_context_unref (cmp->own_ctx);
g_weak_ref_clear (&cmp->agent_ref);
g_atomic_int_inc (&n_components_destroyed);
nice_debug ("Destroyed NiceComponent (%u created, %u destroyed)",
n_components_created, n_components_destroyed);
G_OBJECT_CLASS (nice_component_parent_class)->finalize (obj);
}
/**
* ComponentSource:
*
* This is a GSource which wraps a single Component and is dispatched whenever
* any of its NiceSockets are dispatched, i.e. it proxies all poll() events for
* every socket in the Component. It is designed for use by GPollableInputStream
* and GPollableOutputStream, so that a Component can be incorporated into a
* custom main context iteration.
*
* The callbacks dispatched by a ComponentSource have type GPollableSourceFunc.
*
* ComponentSource supports adding a GCancellable child source which will
* additionally dispatch if a provided GCancellable is cancelled.
*
* Internally, ComponentSource adds a new GSocketSource for each socket in the
* Component. Changes to the Component’s list of sockets are detected on each
* call to component_source_prepare(), which compares a stored age with the
* current age of the Component’s socket list — if the socket list has changed,
* the age will have increased (indicating added sockets) or will have been
* reset to 0 (indicating all sockets have been closed).
*/
typedef struct {
GSource parent;
GObject *pollable_stream; /* owned */
GWeakRef agent_ref;
guint stream_id;
guint component_id;
guint component_socket_sources_age;
/* SocketSource, free with free_child_socket_source() */
GSList *socket_sources;
GIOCondition condition;
} ComponentSource;
static gboolean
component_source_prepare (GSource *source, gint *timeout_)
{
ComponentSource *component_source = (ComponentSource *) source;
/* We can’t be sure if the ComponentSource itself needs to be dispatched until
* poll() is called on all the child sources. */
gboolean skip_poll = FALSE;
NiceAgent *agent;
NiceComponent *component;
GSList *parentl, *childl;
agent = g_weak_ref_get (&component_source->agent_ref);
if (!agent)
return FALSE;
/* Needed due to accessing the Component. */
agent_lock (agent);
if (!agent_find_component (agent,
component_source->stream_id, component_source->component_id, NULL,
&component))
goto done;
if (component->rfc4571_wakeup_needed) {
component->rfc4571_wakeup_needed = FALSE;
skip_poll = TRUE;
goto done;
}
if (component->socket_sources_age ==
component_source->component_socket_sources_age)
goto done;
/* If the age has changed, either
* - one or more new socket has been prepended
* - old sockets have been removed
*/
/* Add the new child sources. */
for (parentl = component->socket_sources; parentl; parentl = parentl->next) {
SocketSource *parent_socket_source = parentl->data;
SocketSource *child_socket_source;
if (parent_socket_source->socket->fileno == NULL)
continue;
/* Iterating the list of socket sources every time isn't a big problem
* because the number of pairs is limited ~100 normally, so there will
* rarely be more than 10.
*/
childl = g_slist_find_custom (component_source->socket_sources,
parent_socket_source->socket, _find_socket_source);
/* If we have reached this state, then all sources new sources have been
* added, because they are always prepended.
*/
if (childl)
break;
child_socket_source = g_slice_new0 (SocketSource);
child_socket_source->socket = parent_socket_source->socket;
child_socket_source->source =
g_socket_create_source (child_socket_source->socket->fileno, G_IO_IN,
NULL);
source_set_dummy_callback (child_socket_source->source);
g_source_add_child_source (source, child_socket_source->source);
g_source_unref (child_socket_source->source);
component_source->socket_sources =
g_slist_prepend (component_source->socket_sources, child_socket_source);
}
for (childl = component_source->socket_sources;
childl;) {
SocketSource *child_socket_source = childl->data;
GSList *next = childl->next;
parentl = g_slist_find_custom (component->socket_sources,
child_socket_source->socket, _find_socket_source);
/* If this is not a currently used socket, remove the relevant source */
if (!parentl) {
g_source_remove_child_source (source, child_socket_source->source);
g_slice_free (SocketSource, child_socket_source);
component_source->socket_sources =
g_slist_delete_link (component_source->socket_sources, childl);
}
childl = next;
}
/* Update the age. */
component_source->component_socket_sources_age = component->socket_sources_age;
done:
agent_unlock_and_emit (agent);
g_object_unref (agent);
return skip_poll;
}
static gboolean
component_source_dispatch (GSource *source, GSourceFunc callback,
gpointer user_data)
{
ComponentSource *component_source = (ComponentSource *) source;
GPollableSourceFunc func = (GPollableSourceFunc) G_CALLBACK (callback);
return func (component_source->pollable_stream, user_data);
}
static void
free_child_socket_source (gpointer data)
{
g_slice_free (SocketSource, data);
}
static void
component_source_finalize (GSource *source)
{
ComponentSource *component_source = (ComponentSource *) source;
g_slist_free_full (component_source->socket_sources, free_child_socket_source);
g_weak_ref_clear (&component_source->agent_ref);
g_object_unref (component_source->pollable_stream);
component_source->pollable_stream = NULL;
}
static gboolean
component_source_closure_callback (GObject *pollable_stream, gpointer user_data)
{
GClosure *closure = user_data;
GValue param_value = G_VALUE_INIT;
GValue result_value = G_VALUE_INIT;
gboolean retval;
g_value_init (&result_value, G_TYPE_BOOLEAN);
g_value_init (¶m_value, G_TYPE_OBJECT);
g_value_set_object (¶m_value, pollable_stream);
g_closure_invoke (closure, &result_value, 1, ¶m_value, NULL);
retval = g_value_get_boolean (&result_value);
g_value_unset (¶m_value);
g_value_unset (&result_value);
return retval;
}
static GSourceFuncs component_source_funcs = {
component_source_prepare,
NULL, /* check */
component_source_dispatch,
component_source_finalize,
(GSourceFunc) G_CALLBACK (component_source_closure_callback),
};
/**
* nice_component_source_new:
* @agent: a #NiceAgent
* @stream_id: The stream's id
* @component_id: The component's number
* @pollable_stream: a #GPollableInputStream or #GPollableOutputStream to pass
* to dispatched callbacks
* @cancellable: (allow-none): a #GCancellable, or %NULL
*
* Create a new #ComponentSource, a type of #GSource which proxies poll events
* from all sockets in the given @component.
*
* A callback function of type #GPollableSourceFunc must be connected to the
* returned #GSource using g_source_set_callback(). @pollable_stream is passed
* to all callbacks dispatched from the #GSource, and a reference is held on it
* by the #GSource.
*
* The #GSource will automatically update to poll sockets as they’re added to
* the @component (e.g. during peer discovery).
*
* Returns: (transfer full): a new #ComponentSource; unref with g_source_unref()
*/
GSource *
nice_component_input_source_new (NiceAgent *agent, guint stream_id,
guint component_id, GPollableInputStream *pollable_istream,
GCancellable *cancellable)
{
ComponentSource *component_source;
g_assert (G_IS_POLLABLE_INPUT_STREAM (pollable_istream));
component_source =
(ComponentSource *)
g_source_new (&component_source_funcs, sizeof (ComponentSource));
g_source_set_name ((GSource *) component_source, "ComponentSource");
component_source->component_socket_sources_age = 0;
component_source->pollable_stream = g_object_ref (pollable_istream);
g_weak_ref_init (&component_source->agent_ref, agent);
component_source->stream_id = stream_id;
component_source->component_id = component_id;
/* Add a cancellable source. */
if (cancellable != NULL) {
GSource *cancellable_source;
cancellable_source = g_cancellable_source_new (cancellable);
source_set_dummy_callback (cancellable_source);
g_source_add_child_source ((GSource *) component_source,
cancellable_source);
g_source_unref (cancellable_source);
}
return (GSource *) component_source;
}
TurnServer *
turn_server_new (const gchar *server_ip, guint server_port,
const gchar *username, const gchar *password, NiceRelayType type)
{
TurnServer *turn = g_slice_new0 (TurnServer);
nice_address_init (&turn->server);
turn->ref_count = 1;
turn->server_port = server_port;
if (nice_address_set_from_string (&turn->server, server_ip))
nice_address_set_port (&turn->server, server_port);
else
turn->server_address = g_strdup (server_ip);
turn->username = g_strdup (username);
turn->password = g_strdup (password);
turn->decoded_username =
g_base64_decode ((gchar *)username, &turn->decoded_username_len);
turn->decoded_password =
g_base64_decode ((gchar *)password, &turn->decoded_password_len);
turn->type = type;
return turn;
}
TurnServer *
turn_server_ref (TurnServer *turn)
{
turn->ref_count++;
return turn;
}
void
turn_server_unref (TurnServer *turn)
{
turn->ref_count--;
if (turn->ref_count == 0) {
g_free (turn->server_address);
g_free (turn->username);
g_free (turn->password);
g_free (turn->decoded_username);
g_free (turn->decoded_password);
g_slice_free (TurnServer, turn);
}
}
TurnServer *
turn_server_copy (TurnServer *turn)
{
TurnServer *copy = g_slice_new0 (TurnServer);
copy->ref_count = 1;
copy->server = turn->server;
copy->server_address = g_strdup (turn->server_address);
copy->username = g_strdup (turn->username);
copy->password = g_strdup (turn->password);
copy->decoded_username = g_memdup (turn->decoded_username,
turn->decoded_username_len);
copy->decoded_password = g_memdup (turn->decoded_password,
turn->decoded_password_len);
copy->decoded_username_len = turn->decoded_username_len;
copy->decoded_password_len = turn->decoded_password_len;
copy->type = turn->type;
copy->preference = turn->preference;
return copy;
}
void
nice_component_add_valid_candidate (NiceAgent *agent, NiceComponent *component,
const NiceCandidate *candidate)
{
guint count = 0;
GList *item, *last = NULL;
for (item = component->valid_candidates; item; item = item->next) {
NiceCandidate *cand = item->data;
last = item;
count++;
if (nice_candidate_equal_target (cand, candidate))
return;
}
/* New candidate */
if (nice_debug_is_enabled ()) {
char str[INET6_ADDRSTRLEN];
nice_address_to_string (&candidate->addr, str);
nice_debug ("Agent %p : %d:%d Adding valid source"
" candidate: %s:%d trans: %d", agent,
candidate->stream_id, candidate->component_id, str,
nice_address_get_port (&candidate->addr), candidate->transport);
}
component->valid_candidates = g_list_prepend (
component->valid_candidates, nice_candidate_copy (candidate));
/* Delete the last one to make sure we don't have a list that is too long,
* the candidates are not freed on ICE restart as this would be more complex,
* we just keep the list not too long.
*/
if (count > NICE_COMPONENT_MAX_VALID_CANDIDATES) {
NiceCandidate *cand = last->data;
component->valid_candidates = g_list_delete_link (
component->valid_candidates, last);
nice_candidate_free (cand);
}
}
gboolean
nice_component_verify_remote_candidate (NiceComponent *component,
const NiceAddress *address, NiceSocket *nicesock)
{
GList *item;
if (component->fallback_mode)
return TRUE;
for (item = component->valid_candidates; item; item = item->next) {
NiceCandidate *cand = item->data;
if ((((nicesock->type == NICE_SOCKET_TYPE_TCP_BSD ||
nicesock->type == NICE_SOCKET_TYPE_UDP_TURN) &&
(cand->transport == NICE_CANDIDATE_TRANSPORT_TCP_ACTIVE ||
cand->transport == NICE_CANDIDATE_TRANSPORT_TCP_PASSIVE ||
cand->transport == NICE_CANDIDATE_TRANSPORT_TCP_SO)) ||
cand->transport == NICE_CANDIDATE_TRANSPORT_UDP) &&
nice_address_equal (address, &cand->addr)) {
/* fast return if it's already the first */
if (item == component->valid_candidates)
return TRUE;
/* Put the current candidate at the top so that in the normal use-case,
* this function becomes O(1).
*/
component->valid_candidates = g_list_remove_link (
component->valid_candidates, item);
component->valid_candidates = g_list_concat (item,
component->valid_candidates);
return TRUE;
}
}
return FALSE;
}
/* Must be called with agent lock held */
/* Returns a transfer full GPtrArray of GSocket */
GPtrArray *
nice_component_get_sockets (NiceComponent *component)
{
GPtrArray *array = g_ptr_array_new_with_free_func ((GDestroyNotify) g_object_unref);
GSList *item;
for (item = component->socket_sources; item; item = item->next) {
SocketSource *source = item->data;
NiceSocket *nicesock = source->socket;
if (nicesock->fileno && !g_ptr_array_find (array, nicesock->fileno, NULL))
g_ptr_array_add (array, g_object_ref (nicesock->fileno));
}
return array;
}
guint
nice_component_compute_rfc4571_headroom (NiceComponent *component)
{
return component->rfc4571_buffer_offset - component->rfc4571_frame_offset;
}
gboolean
nice_component_resolving_turn (NiceComponent *component)
{
GList *item;
for (item = component->turn_servers; item; item = item->next) {
TurnServer *turn = item->data;
if (turn->resolution_failed)
continue;
if (!nice_address_is_valid (&turn->server))
return TRUE;
}
return FALSE;
}
|